21124300000 has 144 divisors (see below), whose sum is σ = 52849679904. Its totient is φ = 8308800000.

The previous prime is 21124299983. The next prime is 21124300019. The reversal of 21124300000 is 342112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6098269 + ... + 6101731.

It is an arithmetic number, because the mean of its divisors is an integer number (367011666).

Almost surely, 2^21124300000 is an apocalyptic number.

21124300000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26424839952).

21124300000 is an abundant number, since it is smaller than the sum of its proper divisors (31725379904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124300000 is an frugal number, since it uses more digits than its factorization.

21124300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21124300000 its reverse (342112), we get a palindrome (21124642112).

The spelling of 21124300000 in words is "twenty-one billion, one hundred twenty-four million, three hundred thousand".